从日期数组中减去一个月

import datetime

def subtract_one_month(date_array):
    new_date_array = []
    for date_str in date_array:
        date_obj = datetime.datetime.strptime(date_str, "%Y-%m-%d")
        # 减去一个月
        if date_obj.month == 1:
            new_date_obj = datetime.datetime(date_obj.year - 1, 12, date_obj.day)
        else:
            new_date_obj = datetime.datetime(date_obj.year, date_obj.month - 1, date_obj.day)
        new_date_str = new_date_obj.strftime("%Y-%m-%d")
        new_date_array.append(new_date_str)
    return new_date_array

# 示例日期数组
dates = ["2022-01-15", "2022-02-28", "2022-03-31"]
# 调用函数进行计算
new_dates = subtract_one_month(dates)
# 打印结果
print(new_dates)

['2021-12-15', '2022-01-28', '2022-02-28']